Retractable block heater cord unit



FIG. 1 is a perspective front side view of a retractable block heater cord unit;

FIG. 2 is a perspective back side view of a retractable block heater cord unit thereof;

FIG. 3 is a perspective bottom side view of a retractable block heater cord unit thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof, wherein a right side view is a mirror image of the left side view;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

CLAIM The ornamental design for a retractable block heater cord unit, as shown and described. 